Editing Images

I'm trying to edit images that I'm uploading to my media library. When I try to crop or scale them, it's not saving them in the edited form. It either remains as it was, or gives me the little broken icon without displaying the image. I've edited images many, many times on my blog, and this is the first time this has happened. It seems to happen in both Chrome and Internet Explorer. Any suggestions?

OK--I'm running Chrome Chrome 23.0.1271.95. I also have IE 8, but I usually use Chrome. I've cleared the cache. The third-party cookies are enabled, and I'm not running extensions. I looked at the link you gave, and that's what I'm doing. I still can't edit pictures--when I try to crop or scale, it doesn't indicate a change, and the "Save" button is not enabled. The button looks like it does under the cropping screenshot at the media handling link you gave--the letters are dark, and when I put the cursor over it the hand doesn't pop up indicating I can click it.

Thank you for the response. Unfortunately, the liked article did not help. I tried again and took screenshots at each stage to show what's happening. I apparently can't do attachments here, so I uploaded the screenshots to my media library and have linked to them in order: here, here, here, here, here, here, and here.